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Current Electricity — JEE physics STD 12 Science — Question

CBSE BoardEnglish MediumSTD 12 ScienceJEE physicsCurrent Electricity1 Mark
Question
Assertion : Voltameter measures current more accurately than ammeter.
Reason : Relative error will be small if measured from voltameter.
✓

Answer

(a) Voltameter measures current indirectly in terms of mass of ions deposited and electrochemical equivalent of the substance $\left(I=\frac{m}{Z t}\right)$. Since value of $m$ and $Z$ are measured to 3 rd decimal place and 5 th decimal place respectively.The relative error in the measurement of current by voltmeter will be very small as compared to that when measured by ammeter directly.

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